[Bug 281003] NFS client can open the server on ZFS with sharenfs dataset

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281003

Rick Macklem <rmacklem@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Individual Port(s)          |bin
                 CC|                            |rmacklem@FreeBSD.org
           Assignee|fs@FreeBSD.org              |rmacklem@FreeBSD.org
            Version|Latest                      |Unspecified
            Product|Ports & Packages            |Base System

--- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> ---
This appears to be a bug in mountd.
-ro=192.168.1.56 is bogus, but mountd
does not spot it as an error.

Btw, both of your sharenfs settings are
bogus, since -ro is not supposed to have
"=192.168.1.56" after it.

All the sharenfs property does is autogenerate
an exports line. It can be found in /etc/zfs/exports
and should obey the same syntax as "man 5 exports"
describes.
(Althougn the sharenfs parser in OpenZFS should be
improved, the bogus case should not get past mountd.)

I'll take a look at mountd.c and try to come up with a patch.

I am not sure what you were trying to do by specifying one
IP address followed by ro=anther-ip, but you cannot mix read/write
and read-only exports on the same line.
--> Until you have the very recent patch in PR#147881,
    you cannot generate multiple lines via sharenfs.
   --> To do multiple lines, you need to create them manually in
       /etc/exports and not use the sharenfs property.


Thanks for reporting it, rick
ps: And never put a "=XXX" after "ro" for an exports option.

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